Optimal surface roughness of die steels in powder mixed electrical discharge machining using titan powder

Abstract

This paper introduces the research results of surface roughness of steel molds after roughing and fine machining by PMEDM using titanium powder. The influence of the concentration of titanium powder mixed dielectric fluid to the surface roughness (R_a) is surveyed in roughing machining, and the regression equation to describe this relationship and the optimal value R_a (R_atoiuu) also be established. The process parameters: electrode material, workpiece material, electrode polarity, pulse on time, pulse of time, current and concentration of titanium powder is used in research on SR of fine machining. The influence of the process parameters to R through the average value of R and its ratio S/N has given By Taguchi method. Results indicated that: current, electrode material, pulse on time, electrode polarity and the interaction between the electrode material with powder concentration greatest impact to R_a and the optimal value R_atoiuu is 1.73 ±0.39µm.